Question

The formula for the circumfrince, C,Of a circle with a radius r is C=2pi rA circle has a circumfrince of 32Pi units what is the raidus of the circle and what is the exact area of the circle?

Answer 1

r=16 Area=256 units²

Explanation:

C=2πr

C=32π units

32π=2×π×r

divide both sides by π

32π/π= 2πr/π

32=2r ...... divide both sides by 2

r=16

Area of a circle=πr²

= π×16×16

=256π units²